Optical imaging lens

Abstract

The invention discloses an optical imaging lens, which comprises a lens group and a spacing element group, and is characterized in that the lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, the center thickness of the third lens on the optical axis is larger than the center thickness of any lens in the lens group except the third lens on the optical axis. The spacing element group comprises a second spacing element and a third spacing element; the optical imaging lens satisfies the following conditions: 2.08 lt; cP3 / T34lt; 6.54, 0.84 lt, 6.54, and 0.84 lt; d2m / CT3lt; 1.50, 1.50; wherein CP3 is the maximum thickness of the third spacing element in the optical axis direction, T34 is the spacing distance between the third lens and the fourth lens on the optical axis, d2m is the inner diameter of the image side face of the second spacing element, and CT3 is the center thickness of the third lens on the optical axis.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an optical imaging lens. Background Art

[0002] In recent years, with the increasing changes in consumer demands, the requirements for optical imaging lenses have gradually become more complex and diverse. In different application scenarios, the performance of optical imaging lenses varies.

[0003] Six-piece optical imaging lenses are widely used in fields such as mobile phones, VR head-mounted devices, smart watches, smart glasses, and drones. However, existing six-piece optical imaging lenses still have some deficiencies in terms of imaging quality and processability. For example, the unreasonable setting of the spacer elements between adjacent lenses will affect the assembly stability of the lens and the transmission of light, thereby affecting the imaging quality of the lens. Therefore, how to reasonably arrange the spatial layout and related parameters of the lenses and spacer elements to continuously improve the performance requirements of the lens and seek breakthroughs in structure innovation has become a development direction for many lens manufacturers to enhance their competitiveness. Summary of the Invention

[0004] This application provides an optical imaging lens, which includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Among them, the central thickness of the third lens on the optical axis is greater than the central thickness of any other lens in the lens group except the third lens on the optical axis; the spacer element group includes a second spacer element and a third spacer element. The second spacer element is placed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is placed between the third lens and the fourth lens and contacts the image side surface of the third lens; the optical imaging lens satisfies: 2.08 < CP3 / T34 < 6.54 and 0.84 < d2m / CT3 < 1.50; where CP3 is the maximum thickness of the third spacer element along the optical axis direction, T34 is the spacing distance between the third lens and the fourth lens on the optical axis, d2m is the inner diameter of the image side surface of the second spacer element, and CT3 is the central thickness of the third lens on the optical axis.

[0005] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element. The fifth spacer element is placed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 2.67 < f6 / (CP5 + CT6) < 4.64 and -4.34 < f5 / CP5 < -2.12, where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, CP5 is the maximum thickness of the fifth spacer element along the optical axis direction, and CT6 is the central thickness of the sixth lens on the optical axis.

[0006] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 17.28 < T56 / T45 < 20.75 and 16.21 < CP5 / T45 < 33.68, where T45 is the axial spacing distance between the fourth lens and the fifth lens, T56 is the axial spacing distance between the fifth lens and the sixth lens, and CP5 is the maximum thickness of the fifth spacer element in the axial direction.

[0007] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 1.43 < (D5s - d5s) / T56 < 3.13, where D5s is the outer diameter of the object side surface of the fifth spacer element, d5s is the inner diameter of the object side surface of the fifth spacer element, and T56 is the axial spacing distance between the fifth lens and the sixth lens.

[0008] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and contacts the image side surface of the first lens; the optical imaging lens satisfies: -3.76 < D1m / R3 < -1.96 and 5.46 < f2 / R4 < 7.56, where D1m is the outer diameter of the image side surface of the first spacer element, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, and f2 is the effective focal length of the second lens.

[0009] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and contacts the image side surface of the first lens; the optical imaging lens satisfies: 0.42 < (D1s - d1s) / (D2s - d2s) < 1.56, where D1s is the outer diameter of the object side surface of the first spacer element, d1s is the inner diameter of the object side surface of the first spacer element, D2s is the outer diameter of the object side surface of the second spacer element, and d2s is the inner diameter of the object side surface of the second spacer element.

[0010] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and contacts the image side surface of the first lens; the optical imaging lens satisfies: 1.51 < SAG12 / (CT1 + CP1) < 2.05, where SAG12 is the axial distance between the intersection point of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens, CT1 is the central thickness of the first lens on the optical axis, and CP1 is the maximum thickness of the first spacer element in the axial direction.

[0011] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens, and the fifth spacer element is disposed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 2.06 < EP45 / CT5 < 2.74, where EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis direction, and CT5 is the central thickness of the fifth lens on the optical axis.

[0012] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 30.13 < CT4 / T45 < 44.70 and 2.26 < d3m / CT4 < 3.11, where CT4 is the central thickness of the fourth lens on the optical axis, T45 is the distance between the fourth lens and the fifth lens on the optical axis, and d3m is the inner diameter of the image side surface of the third spacer element.

[0013] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: -10.40 < f2 / (D2s - d2s) < -4.60, where f2 is the effective focal length of the second lens, D2s is the outer diameter of the object side surface of the second spacer element, and d2s is the inner diameter of the object side surface of the second spacer element.

[0014] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 4.99 < (CT2 + CP2) / T23 < 34.52, where CT2 is the central thickness of the second lens on the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis direction, and T23 is the distance between the second lens and the third lens on the optical axis.

[0015] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 1.04 < d0m / d0s < 1.44, where d0m is the inner diameter of the image side end face of the lens barrel, and d0s is the inner diameter of the object side end face of the lens barrel.

[0016] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 1.24 < f3 / (CT3 - CP3) < 16.94, where f3 is the effective focal length of the third lens.

[0017] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 1.13 < R5 / d2m < 2.10 and 0.75 < SAG31 / T23 < 7.15, where R5 is the curvature radius of the object side surface of the third lens, SAG31 is the axial distance between the intersection point of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens, and T23 is the distance between the second lens and the third lens on the optical axis.

[0018] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 1.09 < D3m / f4 < 1.70, where D3m is the outer diameter of the image side of the third spacer element, and f4 is the effective focal length of the fourth lens.

[0019] The optical imaging lens provided by the present application includes six lenses. Among them, the third lens has the largest thickness, and the combination of the third lens and its front and rear spacer elements has a great influence on the final imaging quality. In the present application, a second spacer element and a third spacer element are respectively provided on the image side of the second lens and the third lens, and by controlling the ratios of the conditional CP3 / T34 and d2m / CT3 within a certain range, it is beneficial to control the bending degrees of the third lens and the fourth lens within a reasonable range, ensure the transmission of light, ensure the thickness of the third spacer element and its processability, and at the same time, the clear aperture of the third lens can be limited within a reasonable range, improving the imaging brightness, and further improving the imaging quality of the optical imaging lens. Description of the Drawings

[0020] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more obvious. Among them:

[0021] Figure 1 It shows a schematic diagram of the structural arrangement and some parameters of an optical imaging lens of the present application;

[0022] Figure 2 It shows a schematic diagram of the structure of the optical imaging lens of Embodiment 1 of the present application;

[0023] Figure 3 It shows a schematic diagram of the structure of the optical imaging lens of Embodiment 2 of the present application;

[0024] Figure 4 It shows a schematic diagram of the structure of the optical imaging lens of Embodiment 3 of the present application;

[0025] Figure 5 It shows the axial chromatic aberration curve (A1), astigmatism curve (B1), and lateral chromatic aberration curve (C1) of the optical imaging lens of Embodiments 1 to 3 of the present application;

[0026] Figure 6 It shows a schematic diagram of the structure of the optical imaging lens of Embodiment 4 of the present application;

[0027] Figure 7 It shows a schematic diagram of the structure of the optical imaging lens of Embodiment 5 of the present application;

[0028] Figure 8 It shows a schematic diagram of the structure of the optical imaging lens of Embodiment 6 of the present application;

[0029] Fig. 9 The axial chromatic aberration curve (A2), the astigmatism curve (B2), and the magnification chromatic aberration curve (C2) of the optical imaging lenses of Examples 4 to 6 of the present application are shown;

[0030] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;

[0031] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;

[0032] Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown;

[0033] Fig.13 The axial chromatic aberration curve (A3), the astigmatism curve (B3) and the magnification chromatic aberration curve (C3) of the optical imaging lenses of Examples 7 to 9 of the present application are shown;

[0034] Fig.14 The defocus curve diagram of the optical imaging lens of the present application is shown when CP3 / T34=3.28 and d2m / CT3=0.01 are satisfied;

[0035] Fig.15 The defocus curve diagram of the optical imaging lens of the present application is shown when CP3 / T34=3.28 and d2m / CT3=1.28 are satisfied;

[0036] Fig.16 The figure shows a defocus curve diagram of the optical imaging lens of the present application when CP3 / T34=3.28 and d2m / CT3=16 are satisfied. DETAILED DESCRIPTION

[0037] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0038] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0039] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0040] In this article, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The paraxial region refers to the region near the optical axis. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0041] It should also be understood that the terms "including" and / or "having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing the embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0042] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrels, and spacer element groups in the various embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment being only combined with the lens barrels, spacer element groups, etc. of the embodiment.

[0044] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0045] Figure 1 The schematic diagram of the structure arrangement and some parameters of an optical imaging lens of the present application is shown as an example to facilitate a better understanding of the present application. Figure 1 As shown, CP2 is the maximum thickness of the second spacer element along the optical axis direction, CP3 is the maximum thickness of the third spacer element along the optical axis direction, CP5 is the maximum thickness of the fifth spacer element along the optical axis direction, D2s is the outer diameter of the object side surface of the second spacer element, D5s is the outer diameter of the object side surface of the fifth spacer element, D1s is the outer diameter of the object side surface of the first spacer element, d0s is the inner diameter of the object side end face of the lens barrel, d5s is the inner diameter of the object side surface of the fifth spacer element, d1s is the inner diameter of the object side surface of the first spacer element, d2s is the inner diameter of the object side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, d3m is the inner diameter of the image side surface of the third spacer element, D3m is the outer diameter of the image side surface of the third spacer element, D1m is the outer diameter of the image side surface of the first spacer element, d0m is the inner diameter of the image side end face of the lens barrel, and EP45 is the distance along the optical axis between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element.

[0046] Reference Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 、 Figure 8 、 Fig.10 、 Fig.11 and Fig.12 According to references

[0047] The third lens in the optical imaging lens provided by the present application has the largest thickness, and the combination of the third lens and the spacer elements before and after it has a great influence on the final imaging quality. The present application arranges the second spacer element and the third spacer element on the image side of the second lens and the third lens respectively, and controls the ratio of the conditional formula CP3 / T34 within a certain range, which is conducive to controlling the curvature of the third lens and the fourth lens within a reasonable range, ensuring the transmission of light, and at the same time ensuring the thickness of the third spacer element and its processability; and by controlling the ratio of the conditional formula d2m / CT3 within a certain range, the light aperture of the third lens can be limited within a reasonable range, thereby improving the imaging brightness and further improving the imaging quality of the optical imaging lens.

[0048] Fig.14 The figure shows a defocus curve of the optical imaging lens when CP3 / T34=3.28 and d2m / CT3=0.01 are satisfied. Fig.14 The conditional formula CP3 / T34 of the optical imaging lens meets the limited range of this application, which is conducive to controlling the curvature of the third lens and the fourth lens within a reasonable range, ensuring the transmission of light, and at the same time ensuring the thickness of the third spacing element and its processability; however, the conditional formula d2m / CT3 is less than the lower limit of the limited range of this application, and d2m is too small, resulting in a too small aperture of the third lens, which reduces the imaging brightness. Fig.14 It can be seen that the peak position of the defocus curve is relatively scattered and the focus offset is large, which affects the imaging quality of the optical imaging lens.

[0049] Fig.15 The figure shows a defocus curve diagram of the optical imaging lens of the present application when CP3 / T34=3.28 and d2m / CT3=1.28 are satisfied. Fig.15 The conditional formulas CP3 / T34 and d2m / CT3 of the optical imaging lens meet the limited range of the present application, which is conducive to controlling the curvature of the third lens and the fourth lens within a reasonable range, ensuring the transmission of light, and at the same time ensuring the thickness of the third spacing element and its processability, which can limit the light aperture of the third lens within a reasonable range, improve the imaging brightness, and thus Fig.15 It can be seen that the peak position of the defocus curve is relatively concentrated, the focus converges well, and good imaging quality can be obtained in each field of view.

[0050] Fig.16 The figure shows a defocus curve diagram of the optical imaging lens when CP3 / T34=3.28 and d2m / CT3=16 are satisfied. Fig.16The conditional formula CP3 / T34 of the optical imaging lens meets the limited range of this application, which is conducive to controlling the curvature of the third lens and the fourth lens within a reasonable range, ensuring the transmission of light, and at the same time ensuring the thickness and processability of the third spacing element; however, the conditional formula d2m / CT3 is greater than the upper limit of the limited range of this application, d2m is too large, and the second spacing element fails to effectively block the excess light in the outer field of view. Fig.16 It can be seen that the peak position of the defocus curve is relatively scattered and the focus offset is serious, which affects the imaging quality of the optical imaging lens.

[0051] In an exemplary embodiment, each lens has at least an object side surface facing the object side and an image side surface facing the imaging surface side. Each lens has an effective diameter area through which light can pass and a non-effective diameter area surrounding the effective diameter area through which light cannot pass. Among the first lens to the sixth lens, any two adjacent lenses may have a spacing distance on the optical axis, and the spacing distance may be an air spacing.

[0052] In an exemplary embodiment, the spacer element group may include at least one spacer element. It should be understood that the present application does not specifically limit the number of spacer elements, at least one spacer element is provided between any two adjacent lenses, and the entire optical imaging lens may also include any number of spacer elements. The spacer element helps the optical imaging lens to intercept redundant refractive and reflective light paths, reduce stray light and ghost images, and improve imaging quality.

[0053] In an exemplary embodiment, the optical imaging lens further includes a lens barrel. The lens group and the spacer element group are placed in the lens barrel. The lens barrel includes an object side end face, an image side end face, an outer annular surface, and an inner annular surface, wherein the end face of the lens barrel closest to the object side is the object side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image side end face of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer annular surface, and the surface of the lens barrel closest to the optical axis is the inner annular surface.

[0054] In an exemplary embodiment, the optical imaging lens may further include an aperture for limiting the light beam. It should be noted that the aperture may be set between or on one side of any lens according to actual needs. Exemplarily, the aperture is set between the second lens and the third lens.

[0055] In an exemplary embodiment, the spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; the optical imaging lens satisfies: 2.67 < f6 / (CP5 + CT6) < 4.64 and -4.34 < f5 / CP5 < -2.12, where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, CP5 is the maximum thickness of the fifth spacer element along the optical axis direction, and CT6 is the central thickness of the sixth lens on the optical axis. By controlling the effective focal lengths of the fifth lens and the sixth lens, it is possible to ensure that the fifth lens and the sixth lens converge light rays. At the same time, by restricting the thickness of the fifth spacer element, it is beneficial to the improvement of stray light and the imaging quality of the optical imaging lens is improved.

[0056] In an exemplary embodiment, the spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; the optical imaging lens satisfies: 17.28 < T56 / T45 < 20.75 and 16.21 < CP5 / T45 < 33.68, where T45 is the spacing distance between the fourth lens and the fifth lens on the optical axis, T56 is the spacing distance between the fifth lens and the sixth lens on the optical axis, and CP5 is the maximum thickness of the fifth spacer element along the optical axis direction. By controlling the above conditions, it is ensured that the spacing distances between the fourth lens, the fifth lens, and the sixth lens on the optical axis are within a reasonable range, and the decline in the imaging quality of the lens caused by large fluctuations in the spacing distance can be effectively reduced during the lens production process.

[0057] In an exemplary embodiment, the spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; the optical imaging lens satisfies: 1.43 < (D5s - d5s) / T56 < 3.13, where D5s is the outer diameter of the object side surface of the fifth spacer element, d5s is the inner diameter of the object side surface of the fifth spacer element, and T56 is the spacing distance between the fifth lens and the sixth lens on the optical axis. By controlling the above conditions, the bearing range of the fifth spacer element on the object side surface is ensured, and the stability of lens assembly is guaranteed; by controlling the spacing distance between the fifth lens and the sixth lens on the optical axis, it helps the sixth lens to converge light rays and ensures the imaging clarity of the lens.

[0058] In an exemplary embodiment, the spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: -3.76 < D1m / R3 < -1.96 and 5.46 < f2 / R4 < 7.56, where D1m is the outer diameter of the image side surface of the first spacer element, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, and f2 is the effective focal length of the second lens. By controlling the above conditions, it is beneficial to control the converging trend of light rays passing through the first lens and the second lens, effectively improving the brightness of the lens, and at the same time enabling the field of view angle of the lens to be controlled within a reasonable range.

[0059] In an exemplary embodiment, the spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: 0.42 < (D1s - d1s) / (D2s - d2s) < 1.56, where D1s is the outer diameter of the object side surface of the first spacer element, d1s is the inner diameter of the object side surface of the first spacer element, D2s is the outer diameter of the object side surface of the second spacer element, and d2s is the inner diameter of the object side surface of the second spacer element. By controlling the inner diameters of the object side surfaces of the first spacer element and the second spacer element, the generation of stray light can be effectively suppressed, ensuring the clarity of imaging. At the same time, by controlling the outer diameters of the object side surfaces of the first spacer element and the second spacer element, the width of the flange surface of the second lens is ensured, thereby ensuring the bearing area of the second lens.

[0060] In an exemplary embodiment, the spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: 1.51 < SAG12 / (CT1 + CP1) < 2.05, where SAG12 is the axial distance between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens, CT1 is the central thickness of the first lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction. By controlling the above conditions, the bending degree of the first lens is restricted, which is beneficial to the processing and forming of the first lens. At the same time, the field of view angle of the lens is increased, ensuring the imaging area of the lens.

[0061] In an exemplary embodiment, the optical imaging lens satisfies: 30.13 < CT4 / T45 < 44.70 and 2.26 < d3m / CT4 < 3.11, where CT4 is the central thickness of the fourth lens on the optical axis, T45 is the distance between the fourth lens and the fifth lens on the optical axis, and d3m is the inner diameter of the image side surface of the third spacer element. By controlling the ratio of the conditional expression CT4 / T45 within a certain range, the central thickness of the fourth lens can be restricted to prevent the risk of welding marks caused by an excessive ratio of the thickness to the thinness of the fourth lens; at the same time, by restricting the distance between the fourth lens and the fifth lens on the optical axis, it is beneficial to ensure the resolution of the lens; by restricting d3m / CT4, the bearing position of the fourth lens is ensured, preventing the fourth lens from being unstable in bearing and improving the assembly stability of the lens.

[0062] In an exemplary embodiment, the optical imaging lens satisfies: -10.40 < f2 / (D2s - d2s) < -4.60, where f2 is the effective focal length of the second lens, D2s is the outer diameter of the object side surface of the second spacer element, and d2s is the inner diameter of the object side surface of the second spacer element. By controlling the above conditions, the curvature of the second lens is controlled, ensuring the transmission of light, and by restricting the inner diameter and outer diameter of the second spacer element, it is beneficial to improve the stray light at the edges of the first lens and the second lens and improve the imaging quality.

[0063] In an exemplary embodiment, the optical imaging lens satisfies: 4.99 < (CT2 + CP2) / T23 < 34.52, where CT2 is the central thickness of the second lens on the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis direction, and T23 is the distance between the second lens and the third lens on the optical axis. By controlling the above conditions, the thickness of the second spacer element is controlled within a reasonable range, which helps to play the role of blocking light of the second spacer element and improve the stray light of the lens; by controlling the central thickness of the second lens on the optical axis and the distance between the second lens and the third lens on the optical axis, it is beneficial to improve the assembly stability of the second lens and the third lens.

[0064] In an exemplary embodiment, the optical imaging lens satisfies: 1.04 < d0m / d0s < 1.44, where d0m is the inner diameter of the image side end face of the lens barrel, and d0s is the inner diameter of the object side end face of the lens barrel. By controlling the above conditions, the sizes of the object side end face and the image side end face of the lens barrel can be restricted to be close to each other, making the step difference of the lens smaller and ensuring the stability of the lens assembly.

[0065] In an exemplary embodiment, the optical imaging lens satisfies: 1.24 < f3 / (CT3 - CP3) < 16.94, where f3 is the effective focal length of the third lens, CP3 is the maximum thickness of the third spacer element along the optical axis direction, and CT3 is the central thickness of the third lens on the optical axis. By controlling the above conditions, it is beneficial to control the bending degree of the third lens, which is conducive to the forming and processing of the third lens. At the same time, by controlling the thickness of the third spacer element, a larger stray light improvement space is ensured, which is beneficial to improving the imaging quality of the lens.

[0066] In an exemplary embodiment, the optical imaging lens satisfies: 1.13 < R5 / d2m < 2.10 and 0.75 < SAG31 / T23 < 7.15, where R5 is the radius of curvature of the object side surface of the third lens, d2m is the inner diameter of the image side surface of the second spacer element, SAG31 is the axial distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens, and T23 is the spacing distance between the second lens and the third lens on the optical axis. By controlling R5 / d2m to control the minimum distance between the second spacer element and the third lens in the direction perpendicular to the optical axis, that is, by controlling the inner diameter of the image side surface of the second spacer element, it is beneficial for the second spacer element to block stray light. At the same time, the processability of the second spacer element is ensured, preventing the inner diameter of the image side surface of the second spacer element from being too small, causing the second spacer element to bend and deflect, resulting in a decrease in the brightness of the lens, or preventing the inner diameter of the image side surface of the second spacer element from being too large, making the second spacer element unable to play the role of blocking stray light; by controlling SAG31 / T23 within a certain range, the bending degree of the third lens and the forming and processing of the third lens are ensured. At the same time, by controlling the spacing distance between the second lens and the third lens on the optical axis, the imaging quality of the lens is ensured.

[0067] In an exemplary embodiment, the optical imaging lens satisfies: 1.09 < D3m / f4 < 1.70, where D3m is the outer diameter of the image side surface of the third spacer element, and f4 is the effective focal length of the fourth lens. By controlling the above conditions, it helps to control the bearing area of the fourth lens, prevent the lens from having a large step difference, and at the same time control the effective focal length of the fourth lens, which is beneficial to ensuring the light transmission path.

[0068] In an exemplary embodiment, the spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens, and the fifth spacer element is disposed between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens. The optical imaging lens satisfies: 2.06 < EP45 / CT5 < 2.74, where EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis. By controlling the edge thickness and the central thickness of the fifth lens, the thickness ratio of the fifth lens can be within the effective molding range, preventing the risk of weld lines in the fifth lens.

[0069] In an exemplary embodiment, the spacer element group further includes a second auxiliary spacer element, a third auxiliary spacer element, and a fifth auxiliary spacer element. The second auxiliary spacer element is disposed on the image side of the second spacer element and at least partially contacts the image side surface of the second spacer element, the third auxiliary spacer element is disposed on the image side of the third spacer element and at least partially contacts the image side surface of the third spacer element, and the fifth auxiliary spacer element is disposed on the image side of the fifth spacer element and at least partially contacts the image side surface of the fifth spacer element, which can improve the stability of lens installation.

[0070] A second aspect of the present application provides an optical imaging lens, which includes a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Among them, the central thickness of the third lens on the optical axis is greater than the central thickness of any one of the lenses in the lens group other than the third lens on the optical axis. The spacer element group includes a first spacer element, and the first spacer element is disposed between the first lens and the second lens and contacts the image side surface of the first lens. The optical imaging lens satisfies: 1.24 < f3 / (CT3 - CP3) < 16.94, where f3 is the effective focal length of the third lens, CP3 is the maximum thickness of the third spacer element along the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By controlling the above conditions, it is beneficial to control the bending degree of the third lens, which is conducive to the molding process of the third lens. At the same time, by controlling the thickness of the third spacer element, a larger stray light improvement space is ensured, which is beneficial to improving the imaging quality of the lens.

[0071] It should be understood that the present application is concerned with the performance optimization of the six-piece lens. Specifically, the present application is concerned with how to reasonably design the light transmission problem before and after the third lens, or issues such as assembly stability, under the premise that the thickness of the third lens is the largest. The specific focal length distribution of the six lenses and the surface configuration of each lens are not the focus of the present application, and these settings can be adjusted accordingly as needed. In other words, although several specific focal length distributions and surface configurations are shown for the imaging lens group in the embodiments of the present application, it should be understood that these embodiments are merely exemplary, and the imaging lens group in the present application should not be limited to the several specific situations shown in the embodiments.

[0072] Those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses and spacer elements constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0073] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0074] Example 1

[0075] Figure 2 FIG. 1 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 1 of the present application. Figure 2 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group disposed in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0076] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is concave.

[0077] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5.

[0078] In the example, light from an object passes through the surfaces S1 to S12 in sequence and is finally imaged on an imaging surface (not shown).

[0079] Table 1 shows the basic parameters of the lens group of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0080] Table 1

[0081]

[0082] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0083]

[0084] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric surface S1 to S12 in Example 1.

[0085] Table 2

[0086] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.2906E-02 -2.5580E-02 1.0199E-02 -3.2805E-03 7.6923E-04 -1.2277E-04 1.2516E-05 -7.3111E-07 1.8550E-08 S2 6.6250E-02 -1.8702E-02 -1.2490E-02 3.0512E-02 -2.9366E-02 1.6095E-02 -5.1821E-03 9.1214E-04 -6.7794E-05 S3 8.3798E-03 -5.0206E-03 9.5557E-04 1.0551E-03 -1.0013E-03 3.9495E-04 -7.3731E-05 4.7322E-06 0.0000E+00 S4 8.8790E-03 -2.5009E-02 4.4190E-02 -4.6939E-02 3.2857E-02 -1.4818E-02 4.1477E-03 -6.5576E-04 4.4817E-05 S5 5.5523E-03 -2.4053E-02 4.0246E-02 -4.3016E-02 3.0884E-02 -1.4535E-02 4.2772E-03 -7.1136E-04 5.0930E-05 S6 -1.4679E-02 3.0812E-03 1.2730E-03 -1.7386E-03 9.8176E-04 -3.2466E-04 6.4074E-05 -6.9440E-06 3.1807E-07 S7 5.9808E-03 -6.1668E-03 3.9903E-03 -1.3884E-03 2.7515E-04 -2.3136E-05 -1.6960E-06 5.1165E-07 -3.0554E-08 S8 2.4050E-02 -6.2040E-02 6.6350E-02 -3.9971E-02 1.4537E-02 -3.2472E-03 4.3677E-04 -3.2491E-05 1.0278E-06 S9 1.1183E-02 -4.5720E-02 5.2625E-02 -3.3200E-02 1.2303E-02 -2.7649E-03 3.7209E-04 -2.7618E-05 8.6977E-07 S10 -1.7773E-02 1.3891E-02 -4.8508E-03 8.0834E-04 1.1513E-05 -3.2871E-05 6.5373E-06 -5.8263E-07 2.0572E-08 S11 -1.7756E-02 4.5789E-03 -1.0550E-03 1.8514E-04 -2.0480E-05 9.9790E-07 3.4791E-08 -6.2467E-09 2.0137E-10 S12 -8.3050E-03 -7.4975E-04 7.4730E-04 -2.2847E-04 4.1109E-05 -4.6881E-06 3.3100E-07 -1.3140E-08 2.2290E-10

[0087] Example 2

[0088] Figure 3 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of the present application. Figure 3 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group disposed in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0089] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5 and a second auxiliary spacer element P2b. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5. The second auxiliary spacer elements P2b are disposed on the image side of the second spacer elements P2 and are in at least partial contact with the image side surfaces of the second spacer elements P2.

[0090] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 1. The basic parameters thereof are detailed in Tables 1 and 2 and will not be described in detail.

[0091] The difference between this embodiment and Embodiment 1 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0092] Example 3

[0093] Figure 4 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of the present application. Figure 4 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group disposed in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0094] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a third auxiliary spacer element P3b and a fifth auxiliary spacer element P5b. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and the object-side surface of the fifth spacer element P5 is in at least partial contact with the image-side surface S10 of the fifth lens E5. The third auxiliary spacer element P3b is disposed on the image side of the third spacer element P3 and is in at least partial contact with the image-side surface of the third spacer element P3. The fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element P5 and is in at least partial contact with the image-side surface of the fifth spacer element P5.

[0095] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 1. The basic parameters thereof are detailed in Tables 1 and 2 and will not be described in detail.

[0096] The difference between this embodiment and Embodiment 1 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0097] Figure 5 (A1) shows the axial chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviation of light rays of different wavelengths from the focal point behind the lens. Figure 5 (B1) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 1 to 3, which represent the meridional image curvature and the sagittal image curvature. Figure 5 (C1) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Figure 5 It can be seen that the optical imaging lenses provided in Examples 1 to 3 can achieve good imaging quality.

[0098] Example 4

[0099] Figure 6 FIG. 4 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of the present application. Figure 6As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group disposed in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0100] The first lens E1 has negative power, its object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative power, its object side surface S3 is concave, and the image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and the image side surface S6 is convex. The fourth lens E4 has positive power, its object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has negative power, its object side surface S9 is concave, and the image side surface S10 is concave. The sixth lens E6 has positive power, its object side surface S11 is convex, and the image side surface S12 is concave.

[0101] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a third auxiliary spacer element P3b and a fifth auxiliary spacer element P5b. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and the object-side surface of the fifth spacer element P5 is in at least partial contact with the image-side surface S10 of the fifth lens E5. The third auxiliary spacer element P3b is disposed on the image side of the third spacer element P3 and is in at least partial contact with the image-side surface of the third spacer element P3. The fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element P5 and is in at least partial contact with the image-side surface of the fifth spacer element P5.

[0102] In the example, light from an object passes through the surfaces S1 to S12 in sequence and is finally imaged on an imaging surface (not shown).

[0103] Table 3 shows the basic parameters of the lens group of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0104] Table 3

[0105]

[0106] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 4 shows the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspherical surfaces S1 to S12 in Embodiment 4.

[0107] Table 4

[0108]

[0109]

[0110] Example 5

[0111] Figure 7 FIG. 5 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of the present application. Figure 7 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group disposed in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0112] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a second auxiliary spacer element P2b, a third auxiliary spacer element P3b and a fifth auxiliary spacer element P5b. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5. The second auxiliary spacer element P2b is placed on the image side of the second spacer element P2 and is at least partially in contact with the image side surface of the second spacer element P2. The third auxiliary spacer element P3b is placed on the image side of the third spacer element P3 and is at least partially in contact with the image side surface of the third spacer element P3. The fifth auxiliary spacer element P5b is placed on the image side of the fifth spacer element P5 and is at least partially in contact with the image side surface of the fifth spacer element P5.

[0113] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Embodiment 4. The basic parameters thereof are detailed in Tables 3 and 4 and will not be described in detail.

[0114] The difference between this embodiment and Embodiment 4 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0115] Example 6

[0116] Figure 8 FIG. 6 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 6 of the present application. Figure 8 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group disposed in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0117] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a second auxiliary spacer element P2b and a fifth auxiliary spacer element P5b. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and the object-side surface of the fifth spacer element P5 is in at least partial contact with the image-side surface S10 of the fifth lens E5. The second auxiliary spacer element P2b is disposed on the image side of the second spacer element P2 and is in at least partial contact with the image-side surface of the second spacer element P2. The fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element P5 and is in at least partial contact with the image-side surface of the fifth spacer element P5.

[0118] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Embodiment 4. The basic parameters thereof are detailed in Tables 3 and 4 and will not be described in detail.

[0119] The difference between this embodiment and Embodiment 4 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0120] Fig. 9 (A2) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig. 9 (B2) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 4 to 6, which represent the meridional image curvature and the sagittal image curvature. Fig. 9 (C2) in FIG. 4 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig. 9 It can be seen that the optical imaging lenses provided in Examples 4 to 6 can achieve good imaging quality.

[0121] Example 7

[0122] Fig.10 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of the present application. Fig.10As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group disposed in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is disposed between the second lens E2 and the third lens E3.

[0123] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is convex, and its image side surface S12 is concave.

[0124] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a third auxiliary spacer element P3b and a fifth auxiliary spacer element P5b. The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is disposed between the fifth lens E5 and the sixth lens E6, and the object-side surface of the fifth spacer element P5 is in at least partial contact with the image-side surface S10 of the fifth lens E5. The third auxiliary spacer element P3b is disposed on the image side of the third spacer element P3 and is in at least partial contact with the image-side surface of the third spacer element P3. The fifth auxiliary spacer element P5b is disposed on the image side of the fifth spacer element P5 and is in at least partial contact with the image-side surface of the fifth spacer element P5.

[0125] In the example, light from an object passes through the surfaces S1 to S12 in sequence and is finally imaged on an imaging surface (not shown).

[0126] Table 5 shows the basic parameters of the lens group of the optical imaging lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0127] Table 5

[0128]

[0129] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical surfaces S1 to S12 that can be used in Example 7.

[0130] Table 6

[0131]

[0132]

[0133] Example 8

[0134] Fig.11 FIG. 8 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 8 of the present application. Fig.11 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group arranged in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is arranged between the second lens E2 and the third lens E3. The spacer element group comprises a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a third auxiliary spacer element P3b, and a fifth auxiliary spacer element P5b.

[0135] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 7. The basic parameters thereof are detailed in Tables 5 and 6 and will not be described in detail.

[0136] The difference between this embodiment and Embodiment 7 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0137] Example 9

[0138] Fig.12 FIG. 1 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 9 of the present application. Fig.12As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group arranged in the lens barrel, and a spacer element group. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. A stop STO (not shown) is arranged between the second lens E2 and the third lens E3. The spacer element group comprises a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a third auxiliary spacer element P3b, and a fifth auxiliary spacer element P5b.

[0139] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 7. The basic parameters thereof are detailed in Tables 5 and 6 and will not be described in detail.

[0140] The difference between this embodiment and Embodiment 7 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0141] Fig.13 (A3) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig.13 (B3) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 7 to 9, which represent the meridional image curvature and the sagittal image curvature. Fig.13 (C3) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig.13 It can be seen that the optical imaging lenses provided in Examples 7 to 9 can achieve good imaging quality.

[0142] Table 7 shows the parameter values ​​of f, f1, f2, f3, f4, f5, f6, SAG31, and SAG12 of each embodiment in Embodiment 1 to Embodiment 9. The units of the parameters listed in Table 7 are all millimeters (mm).

[0143] Table 7

[0144]

[0145] Table 8 gives the values ​​of parameters of at least some elements in the lens barrel and the spacer element group in each embodiment from Embodiment 1 to Embodiment 9. Among them, some parameters can be calculated according to Figure 1 The parameters listed in Table 8 are measured using the marking method shown in the figure, and the units of the parameters listed in Table 8 are all millimeters (mm).

[0146] Table 8

[0147] Parameters / Examples 1 2 3 4 5 6 7 8 9 d1s 3.4315 3.5020 3.4762 4.1324 4.1094 4.1107 3.5529 3.5770 3.5800 D1s 7.6000 7.4494 7.3959 7.4287 7.4547 8.2480 6.9414 5.3488 8.0177 D1m 7.6000 7.4494 7.3959 7.4287 7.4547 8.2480 6.9414 5.3488 8.0177 d2s 3.1827 4.5650 3.1597 4.5270 4.7787 4.6795 3.4109 3.4086 3.4004 d2m 3.1827 3.7370 3.1997 3.1206 3.1674 3.2714 3.4109 3.4086 3.4004 D2s 7.7000 7.1071 7.5874 6.9614 6.9359 7.5610 7.0414 7.5865 8.1177 d3m 5.3781 5.6132 5.4005 4.9421 4.9045 5.0396 5.6244 6.3291 5.1479 D3m 6.9887 7.0796 7.1910 7.2930 7.2870 8.2724 6.7181 7.6561 7.6262 d5s 5.8329 5.6577 5.6110 6.0057 5.4914 5.3523 6.2433 5.6815 6.3705 D5s 7.6637 8.0902 8.4883 7.3464 7.8468 8.0620 8.8130 8.9810 8.0256 d0s 7.1459 7.2453 7.3997 7.7843 8.3709 8.8905 8.4369 9.0039 10.4980 d0m 10.2460 10.0646 9.8169 9.8023 9.4365 9.8092 10.2302 10.4085 10.9464 CP2 0.0220 0.5274 0.0220 1.0044 1.0037 1.1002 0.0210 0.0220 0.0200 CP3 1.9000 1.9124 1.8394 1.1018 0.5841 1.1641 2.2299 2.1276 2.2289 EP45 2.2065 2.1893 / / / 2.2073 1.7477 2.1094 / CP5 1.3335 1.3010 1.2306 1.1681 0.8743 0.8799 1.7854 1.2124 1.8360 CP1 0.022 0.018 0.022 0.016 0.016 0.022 0.022 0.016 0.022

[0148] In summary, the optical imaging lenses in Examples 1 to 9 satisfy the relationship shown in Table 9.

[0149] Table 9

[0150] Conditional / Example 1 2 3 4 5 6 7 8 9 CP3 / T34 2.4079 2.4237 2.3312 6.1825 3.2778 6.5322 2.1836 2.0834 2.1826 d2m / CT3 1.2695 1.4906 1.2763 0.8450 0.8576 0.8858 1.3452 1.3443 1.3410 CT4 / T45 44.6945 44.6945 44.6945 30.1349 30.1349 30.1349 41.7405 41.7405 41.7405 d3m / CT4 2.4690 2.5769 2.4793 3.0425 3.0193 3.1025 2.4712 2.7808 2.2618 f6 / (CP5+CT6) 2.8931 2.9237 2.9923 4.1222 4.6320 4.6211 2.7181 3.2471 2.6795 f2 / (D2s-d2s) -4.6028 -8.1791 -4.6959 -9.2104 -10.3940 -7.7813 -6.0857 -5.2883 -4.6836 T56 / T45 20.7454 20.7454 20.7454 17.2857 17.2857 17.2857 19.3798 19.3798 19.3798 CP5 / T45 27.3605 26.6950 25.2500 21.6705 16.2200 16.3237 32.7431 22.2346 33.6711 D1m / R3 -2.8903 -2.8330 -2.8127 -3.3803 -3.3922 -3.7532 -2.5453 -1.9613 -2.9400 f2 / R4 5.4631 5.4631 5.4631 7.5573 7.5573 7.5573 5.7480 5.7480 5.7480 (D1s-d1s) / (D2s-d2s) 0.9228 1.5528 0.8853 1.3541 1.5508 1.4358 0.9333 0.4241 0.9407 (CT2+CP2) / T23 14.6887 21.3263 14.6887 4.9991 4.9971 5.2647 34.4774 34.5107 34.4441 (T56+CP5) / T45 48.0898 47.4244 45.9793 38.9558 33.5053 33.6090 52.1139 41.6055 53.0419 d0m / d0s 1.4338 1.3891 1.3267 1.2592 1.1273 1.1033 1.2126 1.1560 1.0427 f3 / (CT3-CP3) 8.0875 8.2568 7.3538 1.4889 1.2410 1.5256 16.9358 12.6899 16.8806 D3m / f4 1.4930 1.5124 1.5362 1.0934 1.0925 1.2402 1.4903 1.6984 1.6918 f5 / CP5 -2.8418 -2.9127 -3.0793 -3.2433 -4.3331 -4.3056 -2.1868 -3.2203 -2.1265 R5 / d2m 1.8970 1.6156 1.8869 1.1931 1.1754 1.1381 1.9942 1.9956 2.0004 SAG31 / T23 2.6973 2.6973 2.6973 0.7520 0.7520 0.7520 7.1481 7.1481 7.1481 EP45 / CT5 2.5031 2.4836 / / / 2.7363 2.0696 2.4979 / (D5s-d5s) / T56 1.8122 2.4077 2.8480 1.4390 2.5279 2.9082 2.4329 3.1238 1.5670 SAG12 / (CT1+CP1) 1.5140 1.5140 1.5140 2.0101 2.0101 2.0101 1.5854 1.5854 1.5854

[0151] The present application also provides an electronic device equipped with the optical imaging lens described above. The electronic device can be a wearable device such as a VR helmet, a smart watch, and smart glasses, an independent imaging device such as a digital camera, or a mobile electronic device such as a mobile phone or a tablet computer.

[0152] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical imaging lens, characterized in that: Comprising: A lens group, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Among them, the central thickness of the third lens on the optical axis is greater than the central thickness of any one of the lenses in the lens group other than the third lens on the optical axis; An interval element group, including a second interval element and a third interval element. The second interval element is placed between the second lens and the third lens and is in contact with the image side surface of the second lens. The third interval element is placed between the third lens and the fourth lens and is in contact with the image side surface of the third lens; and A lens barrel that houses the lens group and the interval element group; The optical imaging lens satisfies: 2.08 < CP3 / T34 < 6.54 and 0.84 < d2m / CT3 < 1.50; Wherein, CP3 is the maximum thickness of the third interval element along the optical axis direction, T34 is the interval distance between the third lens and the fourth lens on the optical axis, d2m is the inner diameter of the image side surface of the second interval element, and CT3 is the central thickness of the third lens on the optical axis.

2. The optical imaging lens according to claim 1, wherein: The interval element group further includes a fifth interval element, and the fifth interval element is placed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; The optical imaging lens satisfies: 2.67 < f6 / (CP5 + CT6) < 4.64 and -4.34 < f5 / CP5 < -2.12, where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, CP5 is the maximum thickness of the fifth interval element along the optical axis direction, and CT6 is the central thickness of the sixth lens on the optical axis.

3. The optical imaging lens according to claim 1, wherein: The interval element group further includes a fifth interval element, and the fifth interval element is placed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; The optical imaging lens satisfies: 17.28 < T56 / T45 < 20.75 and 16.21 < CP5 / T45 < 33.68, where T45 is the interval distance between the fourth lens and the fifth lens on the optical axis, T56 is the interval distance between the fifth lens and the sixth lens on the optical axis, and CP5 is the maximum thickness of the fifth interval element along the optical axis direction.

4. The optical imaging lens according to claim 1, wherein: The interval element group further includes a fifth interval element, and the fifth interval element is placed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; The optical imaging lens satisfies: 1.43 < (D5s - d5s) / T56 < 3.13, where D5s is the outer diameter of the object side surface of the fifth interval element, d5s is the inner diameter of the object side surface of the fifth interval element, and T56 is the interval distance between the fifth lens and the sixth lens on the optical axis.

5. The optical imaging lens according to claim 1, wherein: The interval element group further includes a first interval element, and the first interval element is placed between the first lens and the second lens and is in contact with the image side surface of the first lens; The optical imaging lens satisfies: -3.76 < D1m / R3 < -1.96 and 5.46 < f2 / R4 < 7.56, where D1m is the outer diameter of the image side of the first spacer element, R3 is the curvature radius of the object side of the second lens, R4 is the curvature radius of the image side of the second lens, and f2 is the effective focal length of the second lens.

6. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and is in contact with the image side of the first lens; The optical imaging lens satisfies: 0.42 < (D1s - d1s) / (D2s - d2s) < 1.56, where D1s is the outer diameter of the object side of the first spacer element, d1s is the inner diameter of the object side of the first spacer element, D2s is the outer diameter of the object side of the second spacer element, and d2s is the inner diameter of the object side of the second spacer element.

7. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a first spacer element, which is disposed between the first lens and the second lens and is in contact with the image side of the first lens; The optical imaging lens satisfies: 1.51 < SAG12 / (CT1 + CP1) < 2.05, where SAG12 is the axial distance between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens, CT1 is the central thickness of the first lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

8. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the image side of the fourth lens. The fifth spacer element is disposed between the fifth lens and the sixth lens and is in contact with the image side of the fifth lens; The optical imaging lens satisfies: 2.06 < EP45 / CT5 < 2.74, where EP45 is the distance along the optical axis between the image side of the fourth spacer element and the object side of the fifth spacer element, and CT5 is the central thickness of the fifth lens on the optical axis.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The optical imaging lens satisfies: 30.13 < CT4 / T45 < 44.70 and 2.26 < d3m / CT4 < 3.11, where CT4 is the central thickness of the fourth lens on the optical axis, T45 is the spacing distance between the fourth lens and the fifth lens on the optical axis, and d3m is the inner diameter of the image side of the third spacer element.

10. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The optical imaging lens satisfies: -10.40 < f2 / (D2s - d2s) < -4.60, where f2 is the effective focal length of the second lens, D2s is the outer diameter of the object side of the second spacer element, and d2s is the inner diameter of the object side of the second spacer element.

11. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The optical imaging lens satisfies: 4.99 < (CT2 + CP2) / T23 < 34.52, where CT2 is the central thickness of the second lens on the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis direction, and T23 is the distance between the second lens and the third lens on the optical axis.

12. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The optical imaging lens satisfies: 1.04 < d0m / d0s < 1.44, where d0m is the inner diameter of the image-side end face of the lens barrel, and d0s is the inner diameter of the object-side end face of the lens barrel.

13. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The optical imaging lens satisfies: 1.24 < f3 / (CT3 - CP3) < 16.94, where f3 is the effective focal length of the third lens.

14. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The optical imaging lens satisfies: 1.13 < R5 / d2m < 2.10 and 0.75 < SAG31 / T23 < 7.15, where R5 is the radius of curvature of the object-side surface of the third lens, SAG31 is the axial distance between the intersection of the object-side surface of the third lens and the optical axis and the vertex of the effective radius of the object-side surface of the third lens, and T23 is the distance between the second lens and the third lens on the optical axis.

15. The optical imaging lens according to any one of claims 1 to 8, characterized in that: The optical imaging lens satisfies: 1.09 < D3m / f4 < 1.70, where D3m is the outer diameter of the image-side surface of the third spacer element, and f4 is the effective focal length of the fourth lens.

Images